Is Nanotechnology Permanent Head Gasket Block Repair effective on Head Gasket Leaks?

This product is good and does work. You must follow the directions .
In July 2009 our 2000 Malibu V-6 began to overheat in Naperville, Ill. We were on our way home to Scottsdale Az .It was towed to a Pep Boy's where after $50 inspection we were told it needed both head gaskets and heads shaved! 3 days for repairs and $2500 estimate! I looked on the shelf and found a bottle of KW Nanotechnology head gasket sealer for $20 bought it while the mechanics all snickered at me and proceeded to pour it in the car in their parking lot. We headed back to our daughters home approx 6 miles away and I noticed the Temp needle was dropping down to normal range! Next morning we said "what the hell" let's head for AZ and see how far we get! It's now July7, 2010 and 4000+ miles later (including a trip down to Mexico) the car runs like a dream A/C on constantly! This stuff works Big Time! I don't travel without a bottle in the trunk! Thanks KB you saved us $ and our vacation!

First off, no way could anyone tell you that you needed both heads shaved without removing the heads and having them inspected. They might be perfectly fine or may need work. Secondly, these type products are used as an emergency repair and are not permanent no matter what they claim. Thirdly these type products can clog the radiator, heater core, and coolant passages within the engine. You may drive the car for a few thousand mile but in the end You will have the replace the head gaskets. You are just postponing the inevitable and may end up doing more damage. Have it done right and do not use any of these type products.